| 基于低采样率数字去斜的合成孔径激光雷达成像处理 |
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| 作者姓名： | 胡烜 李道京 周建卫 |
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| 作者单位： | 1.中国科学院电子学研究所微波成像技术国家重点实验室, 北京 100190;2.中国科学院大学, 北京 100049 |
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| 基金项目： | 中国科学院电子学研究所创新项目（Y3Z0120247）资助 |
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| 摘 要： | 将低采样率数字去斜技术用于合成孔径激光雷达（SAL），大幅度降低了系统的AD采样率.在此基础上，分析线性调频连续波（LFMCW）体制SAL系统的信号采样和成像处理问题.为降低回波延时误差带来的影响，给出一种延时估计方法.该方法通过截取单个扫频周期信号的回波进行去斜脉压，得到场景对应的延时；针对线性调频（LFM）信号的非线性失真，使用剩余视频相位（RVP）滤波法进行信号校正，保证去斜脉压质量.仿真实验验证了将低采样率数字去斜应用于SAL的可行性.
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| 关 键 词： | 数字去斜 合成孔径激光雷达 AD采样 延时误差 信号校正 成像处理 |
| 收稿时间： | 2016-03-04 |
| 修稿时间： | 2016-04-05 |
Image processing of SAL based on low sampling rate digital dechirp |
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| Authors: | HU Xuan LI Daojing ZHOU Jianwei |
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| Institution: | 1.National Key Lab of Microwave Imaging Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;2.University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In this study, low sampling rate digital dechirp is used in SAL to decrease AD sampling rate of the system. On this basis, signal sampling and imaging processing are analyzed. To depress the influence of time delay error, a method for time delay error estimation is proposed. This method estimates time delay through dechirp with part of echo signal. To ensure the quality of pulse compression, a method based on RVP filtering is used to correct nonlinear distortion of the LFM signal. The feasibility of applying the low sampling rate digital dechirp in SAL is verified by simulations. |
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| Keywords: | digital dechirp SAL AD sampling time delay error signal correcting image processing |
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